the upper end of the range of magification has many variables. what are you going to use the scope for? how much are you going to spend? how well can you see thru a scope? are just a few parameters. i have had to operate off a small buget. my target rifle is a modified factory rifle. in fact, it was originally a winchester western M70 for about 200$ in 300 WM for the ease of getting brass and economy. the scope is a burris signature in 6-24 with mil dot reticle. i can hunt close range with a 6, i keep both eyes open so i see 2 sight pictures and am able to shoot moving game that way. i use the 24 power for long range shooting and spotting. if $ were no problem i would get a nightforce or zeiss in 8-32 power, maybe even a speciallized rifle just for extreme long range and a fixed 40 power for long range and a 6-24 for hunting. the higher the magnification, the more severe the mirage, low light problems increase as well as the limit of shooting in lower light, etc. some people cannot find targets with a fixed high power or spend an inordinate amount of time trying to do so. so it depends on how the shooter sees and his abilities to use the scope proposed. find a friend or a dealer who will loan out various scopes and try them out if you are inexperienced. try low light, bright light, various terrain and weather conditions to find the best one for you. good hunting for all.